Heat pump water heating works with surprisingly low temperatures. For example, if your basement naturally approaches 45-50 degrees from the walls, that's plenty

Heat pump water heating works with surprisingly low temperatures. For example, if your basement naturally approaches 45-50 degrees from the walls, that's plenty to keep a 50-80 gallon tank heated without drawing heat from the rest of the house in the winter. During the other seasons, any incidental cooling is of course a benefit.